&FIELD: CHECK


bins

  The number of bins in the histograms produced by the MAXWELL
  option.

  By default: 100 bins.

eps_Maxwell

  The epsilon used to compute differentials when comparing
  dV/dx and -Ex.

  This parameter is by default set to 1.0E-3.

eps_wire

  The spacing parameter for the Neville extrapolation of the
  points used to get an estimate of the potentials and the
  field at the wire surface.

  This parameter is by default set to 1.0E-5.

FULL

  Switches on all four options: MAXWELL, PLANE, TUBE and WIRE.

MAXWELL

  When this option is selected, tables showing the divergence of the
  electric field, the difference between dV/dx and Ex, between dV/dy
  and Ey and the divergence of the magnetic field are printed. In
  addition, a set of histograms containing related data is plotted.

  The options PRINT and PLOT can be used to reduce the volume of
  output. The histograms produced via this option can be saved with
  the KEEP-RESULTS option.

PLANES

  Compares the potential given to the planes with the potential
  calculated near the field.

TUBE

  Computes the potential and the field near the surface of the tube
  and also prints a check-sum of the charges and the field integral
  around the tube.

WIRES

  Compares the potential given to the wires with the potential
  extrapolated to the wire surface. In addition, the electric field
  on the wire surface is printed - a quantity sometimes used to
  estimate the amplification of the wire.

  If you wish to store these results in global variables, then use
  the KEEP-RESULTS option.

CHARGES

  Verifies that the net flux of the electric field around the
  3-dimensional charges matches the charge of these objects.

KEEP-RESULTS

  When this option is selected, the surface field and potential
  on the selected wires are stored as matrices called EX_n, EY_n,
  E_n, V_n and PHI_n. Also, the histograms from the MAXWELL
  option are kept.

  In case these global variables are already in use, then their
  contents will be lost.

  If (1) the instruction is placed in the body of a DO loop and
  (2) these global variables are used in arithmetic or in IF
  conditions, then you have to declare the global variables before
  the DO loop by assigning them an (arbitrary value). Declaring is
  not required if the variables are only used outside a DO loop,
  e.g. in SAY statements or in procedure calls.

  [The output is not kept by default.]

Keyword index. Formatted on 10/11/98.